正文
上一篇我们讲了关于direct类型的Exchange,这一片我们来了解一下fanout类型的Exchange。
1.Exchange的fanout类型
fanout类型的Exchange的特点是会把消息发送给与之绑定的所有Queue中,我们来测试一下。代码如下
using RabbitMQ.Client;using System;using System.Text;using System.Threading;using System.Threading.Tasks;namespace RabbitMQConsole { class Program { static void Main(string[] args) { ConnectionFactory factory = new ConnectionFactory(); factory.HostName = "39.**.**.**"; factory.Port = 5672; factory.VirtualHost = "/"; factory.UserName = "root"; factory.Password = "root"; var exchange = "change3"; var route = "route2"; var queue3 = "queue3"; var queue4 = "queue4"; var queue5 = "queue5"; using (var connection = factory.CreateConnection()) { using (var channel = connection.CreateModel()) { channel.ExchangeDeclare(exchange, type: "fanout", durable: true, autoDelete: false); channel.QueueDeclare(queue3, durable: true, exclusive: false, autoDelete: false); channel.QueueBind(queue3, exchange, queue3); channel.QueueDeclare(queue4, durable: true, exclusive: false, autoDelete: false); channel.QueueBind(queue4, exchange, queue4); channel.QueueDeclare(queue5, durable: true, exclusive: false, autoDelete: false); channel.QueueBind(queue5, exchange, queue5); var props = channel.CreateBasicProperties(); props.Persistent = true; channel.BasicPublish(exchange, route, true, props, Encoding.UTF8.GetBytes("hello rabbit")); } } } } }
运行代码,去可视化工具中查看一下
消费其中的一个
using RabbitMQ.Client;using RabbitMQ.Client.Events;using System;using System.Text;using System.Threading;namespace RabbitMQClient { class Program { private static readonly ConnectionFactory rabbitMqFactory = new ConnectionFactory() { HostName = "39.**.**.**", Port = 5672, UserName = "root", Password = "root", VirtualHost = "/" }; static void Main(string[] args) { var exchange = "change3"; var route = "route2"; var queue = "queue3"; using (IConnection conn = rabbitMqFactory.CreateConnection()) using (IModel channel = conn.CreateModel()) { channel.ExchangeDeclare(exchange, "fanout", durable: true, autoDelete: false); channel.QueueDeclare(queue, durable: true, exclusive: false, autoDelete: false); channel.QueueBind(queue, exchange, route); channel.BasicQos(prefetchSize: 0, prefetchCount: 50, global: false); EventingBasicConsumer consumer = new EventingBasicConsumer(channel); consumer.Received += (model, ea) => { Byte[] body = ea.Body; String message = Encoding.UTF8.GetString(body); Console.WriteLine( message+Thread.CurrentThread.ManagedThreadId); channel.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false); }; channel.BasicConsume(queue: queue, autoAck: false, consumer: consumer); Console.ReadLine(); } } } }
结果如下
大家可以依次消费其他两个Queue,这里就不演示了
2.消息的过期时间
我们在发送一些消息的时候,有时希望给消息设置一下过期时间,我们可以通过两种方式来设置
2.1设置队列的过期时间
using RabbitMQ.Client;using System;using System.Collections.Generic;using System.Text;using System.Threading;using System.Threading.Tasks;namespace RabbitMQConsole { class Program { static void Main(string[] args) { ConnectionFactory factory = new ConnectionFactory(); factory.HostName = "39.**.**.**"; factory.Port = 5672; factory.VirtualHost = "/"; factory.UserName = "root"; factory.Password = "root"; var exchange = "change4"; var route = "route2"; var queue7 = "queue7"; using (var connection = factory.CreateConnection()) { using (var channel = connection.CreateModel()) { channel.ExchangeDeclare(exchange, type: "fanout", durable: true, autoDelete: false); //队列过期时间,单位毫秒 channel.QueueDeclare(queue7, durable: true, exclusive: false, autoDelete: false,arguments:new Dictionary<string, object> { { "x-message-ttl", 8000 } }); channel.QueueBind(queue7, exchange, queue7); var props = channel.CreateBasicProperties(); props.Persistent = true; channel.BasicPublish(exchange, route, true, props, Encoding.UTF8.GetBytes("hello rabbit")); } } } } }
这样过8秒去Queue就看不到该消息了
2.2设置message的过期时间
using RabbitMQ.Client;using System;using System.Collections.Generic;using System.Text;using System.Threading;using System.Threading.Tasks;namespace RabbitMQConsole { class Program { static void Main(string[] args) { ConnectionFactory factory = new ConnectionFactory(); factory.HostName = "39.**.**.**"; factory.Port = 5672; factory.VirtualHost = "/"; factory.UserName = "root"; factory.Password = "root"; var exchange = "change4"; var route = "route2"; var queue7 = "queue7"; using (var connection = factory.CreateConnection()) { using (var channel = connection.CreateModel()) { channel.ExchangeDeclare(exchange, type: "fanout", durable: true, autoDelete: false); channel.QueueDeclare(queue7, durable: true, exclusive: false, autoDelete: false,arguments:new Dictionary<string, object> { { "x-message-ttl", 8000 } }); channel.QueueBind(queue7, exchange, queue7); var props = channel.CreateBasicProperties(); //message过期时间,单位毫秒 props.Expiration = "30000"; props.Persistent = true; channel.BasicPublish(exchange, route, true, props, Encoding.UTF8.GetBytes("hello rabbit")); } } } } }
我们发现还是8秒就过期了,说明如果同时设置了队列与消息的过期时间,则按照队列的时间过期。我们把队列的过期时间去掉重新试一下。
using RabbitMQ.Client;using System;using System.Collections.Generic;using System.Text;using System.Threading;using System.Threading.Tasks;namespace RabbitMQConsole { class Program { static void Main(string[] args) { ConnectionFactory factory = new ConnectionFactory(); factory.HostName = "39.**.**.**"; factory.Port = 5672; factory.VirtualHost = "/"; factory.UserName = "root"; factory.Password = "root"; var exchange = "change4"; var route = "route2"; var queue7 = "queue7"; using (var connection = factory.CreateConnection()) { using (var channel = connection.CreateModel()) { channel.ExchangeDeclare(exchange, type: "fanout", durable: true, autoDelete: false); channel.QueueDeclare(queue7, durable: true, exclusive: false, autoDelete: false); channel.QueueBind(queue7, exchange, queue7); var props = channel.CreateBasicProperties(); props.Expiration = "30000"; props.Persistent = true; channel.BasicPublish(exchange, route, true, props, Encoding.UTF8.GetBytes("hello rabbit")); } } } } }
3.队列生存时间
我们还可以设置一个队列的生存时间
using RabbitMQ.Client;using System;using System.Collections.Generic;using System.Text;using System.Threading;using System.Threading.Tasks;namespace RabbitMQConsole { class Program { static void Main(string[] args) { ConnectionFactory factory = new ConnectionFactory(); factory.HostName = "39.**.**.**"; factory.Port = 5672; factory.VirtualHost = "/"; factory.UserName = "root"; factory.Password = "root"; var exchange = "change4"; var route = "route2"; var queue8 = "queue8"; using (var connection = factory.CreateConnection()) { using (var channel = connection.CreateModel()) { channel.ExchangeDeclare(exchange, type: "fanout", durable: true, autoDelete: false); channel.QueueDeclare(queue8, durable: true, exclusive: false, autoDelete: false,arguments: new Dictionary<string, object> { { "x-expires",10000} //设置当前队列的过期时间为10000毫秒 }); channel.QueueBind(queue8, exchange, queue8); var props = channel.CreateBasicProperties(); props.Persistent = true; channel.BasicPublish(exchange, route, true, props, Encoding.UTF8.GetBytes("hello rabbit")); } } } } }
这样10秒后队列就消失了
原文出处:https://www.cnblogs.com/chenyishi/p/10239554.html
作者:老六代码